Add some comments so nobody thinks I think fgetc/fputc are fast.
Add some comments so nobody thinks I think fgetc/fputc are fast.

apenwarr/bup,mhoeher/bup,jbaber/bup,tjanez/bup,mhoeher/bup,gevaerts/bup,ToxicFrog/bup,apenwarr/bup,mhoeher/bup,pombredanne/bup,ToxicFrog/bup,pombredanne/bup,tjanez/bup,ToxicFrog/bup,tjanez/bup,tjanez/bup,tjanez/bup,pombredanne/bup,mhoeher/bup,mhoeher/bup,mhoeher/bup,apenwarr/bup,gevaerts/bup,jbaber/bup,pombredanne/bup,jbaber/bup,pombredanne/bup,jbaber/bup,pombredanne/bup,gevaerts/bup,jbaber/bup,gevaerts/bup,jbaber/bup,ToxicFrog/bup,apenwarr/bup,tjanez/bup,ToxicFrog/bup,gevaerts/bup